Dr. Wei Zhou Profile

Dr. Wei Zhou

at Hunan Normal University

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Proceedings Article | 27 March 2022 Paper

A high penetration depth infrared thermometer based on NaGdF4:Yb3+/Er3+/Tm3+ nanorods

Wei Zhou, Xiangling Jin

Proceedings Volume 12169, 12169DK (2022) https://doi.org/10.1117/12.2627490

KEYWORDS: Temperature metrology, Thulium, Erbium, Temperature sensors, Tissues, Luminescence, Ions, Infrared radiation, Far infrared, Nanorods

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In order to develop a sensor that can be used to monitor temperature in organisms, we prepared a binary luminescence temperature probe of Yb³⁺-Er³⁺-Tm³⁺ triple-doped NaGdF₄ nanoparticles. Most optical temperature sensors use the temperature sensitivity of the up-conversion luminescence intensity of rare earth ions to measure temperature. However, the up-conversion emission spectrum is difficult to detect the temperature of deep tissue due to its short wavelength and poor penetration, which greatly limits the biological application range of the temperature sensor. This paper studies the infrared emission spectra based on NaGdF₄: Yb³⁺/Er³⁺/Tm³⁺ nanomaterials, excited by a 980 nm laser. It is found that the fluorescence intensity at the wavelengths of 800 nm, 1240 nm and 1540 nm in the infrared band has different temperature dependence. According to the fluorescence intensity ratio (FIR) technology, we fitted the temperature correlation functions of 800 nm / 1240 nm and 1540 nm / 800 nm, and calculated and analyzed the related sensitivities. The results show that the maximum absolute sensitivity reaches 0.05 K^-1, which is an order of magnitude higher than the FIR sensitivity of the thermal coupling energy level of NaGdF₄: Yb³⁺/Er³⁺. And has a higher tissue penetration ability, more suitable for biological tissue temperature measurement.

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